Players who want to match their character skins with guns should definitely try this mod. Portal gun mods have been around Minecraft for years now, meaning they are quite popular. With the Portal ...

Any Minecraft fan who has played Valve's acclaimed Portal series will likely jump at the chance to use this mod, which introduces Aperture Science's beloved portal gun. By using the attack/use ...

and the post there explains how to install the mod, and how to craft your own Portal gun. If you're still looking for more Portal-in-Minecraft, the mod from last year is available from this old thread ...

Minecraft portals serve ... screens," as modder Johni702 says. The mod affects both Nether and End portals, and is fully functional with both normal portal configurations and arbitrary shapes ...